Quadrature bandpass Delta Sigma modulation for digital radio

被引:119
作者
Jantzi, SA [1 ]
Martin, KW [1 ]
Sedra, AS [1 ]
机构
[1] UNIV TORONTO, DEPT ELECT & COMP ENGN, TORONTO, ON M5S 3G4, CANADA
基金
加拿大自然科学与工程研究理事会;
关键词
analog-digital conversion; CMOS analog integrated circuits; complex filters; digital radio; bandpass sigma-delta modulation; switched-capacitor circuits;
D O I
10.1109/4.643651
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A quadrature bandpass Delta Sigma modulator IC facilitates monolithic digital-radio-receiver design by allowing straightforward ''complex A/D conversion'' of an image-reject mixer's I and Q outputs, Quadrature bandpass BC modulators provide superior performance over pairs of real bandpass Delta Sigma modulators in the conversion of complex input signals, using complex filtering embedded in Delta Sigma loops to efficiently realize asymmetric noise-shaped spectra, The fourth-order prototype IC, clocked at 10 MHz, converts narrowband 3,75-MHz I and Q inputs and attains a dynamic range of 67 dB in 200-kHz (GSM) bandwidth, increasing to 71 and 77 dB in 100- and 30-kHz bandwidths, respectively, Maximum signal-to-noise plus distortion ratio (SNDR) in 200-kHz bandwidth is 62 dB, Power consumption is 130 mW at 5 V, Die size in a 0.8-mu m CMOS process is 2.4 x 1.8 mm(2).
引用
收藏
页码:1935 / 1950
页数:16
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